Juglans nigra - Black Walnut - Photo courtesy of J. Frank Schmidt & Son Co.

Black Walnut

Juglans nigra

  • Tall, oval to rounded, growth habit
  • Large pinnate compound leaves emerge in late spring and drop early fall
  • Foliage colour is dark green in the summer, becoming yellow in early fall
  • Male and female flowers appear before the leaves
  • Nut are encased in yellow-green husks, maturing in autumn
  • Bloom Time: Spring



18-25 m

16-18 m

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Growing and Maintenance Tips:

A great tree for larger landscapes and natural areas. Placement should be considered as the litter from the nuts can be messy. Juglans produce the chemical juglone, and many plants are highly sensitive to this chemical. Look for plants with a tolerance to the toxicity near or under juglans. A great tree for attracting squirrels.

Additional Notes about Black Walnut:

Native to Ontario and other parts of North America.

Native Americans used the nuts for food and boiled the tree sap for syrup. They also reportedly threw the husks into ponds to poison fish, making them easier to catch.